As the US Congress prepares to vote on its budget, how would the Irish presence of a firm like Twitter be affected by the Biden administration’s plan to impose the globally agreed 15 per cent minimum tax both on the consolidated profits of American-headquartered multinationals and in each overseas jurisdiction where they operate? Based on accounts just filed by the social network’s subsidiary in Ireland for 2020, not much. Despite a 5 per cent rise in advertising revenue to €1.1 billion and the addition of nearly 50 employees to reach a total 243, Dublin-based Twitter International Company posted a record…